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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3460268b68ed1ca9f9475e2fd5c2afe6e26650ce24097d036bc1ed3a8cf964' 
  AND token = '0ImFDYcHvwO4bcZQAkPBua0+hAtPcSXRNEYc2oB4vEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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