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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439bac9a217d813f3aaf725963ae6bccad79bce6e5820db6f3e92ffc5308256e' 
  AND token = 'fvMqprQ3M51RprVr0IVJJNvWmtObSoZQ5eCWJb8nnyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}