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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd30b86b453e5450fd75d98ed271bc4391fb0c413c3c7f2c19a31a7abde9370e' 
  AND token = 'DldDfqsh+0paF6tKxJPqSQ2Xnk7e2oF5kx8xHEOAA9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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