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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58878a04e647ddea5ef5b3fa70931d6607d9d1b1ef257d4359cae6d8e61e992a' 
  AND token = 'q11pyaE917cgwk5Dwn8DdNMuXOA+5IjJ0AxYcm/tmaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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