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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6b32c44b2be2deac8e867b74b926671a3bdbcc11e7010fb4c9b9314f720ec0' 
  AND token = '2Dna2xFRJD/3x+KcIRbjzGrhTjSWMhxK0hz3hIg1DVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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