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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '981bbfd20a64743e16f0bd1b6131da11e0064fb753d74277e9d58b279a6a98b3' 
  AND token = 'ldvA8jb9SLLtoAGSCXveIZOkcf1LqxCZI/IwFyle3T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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