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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ea4bc0257647147eba4a725bcd0e3b6ab8e37f4b65336a69763a5e4711762a' 
  AND token = '7y0VtRQW41WY7gtQ1JKRX79qi63HQHbAGB/ry/YAtm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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