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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f9cc2a469c231bc8dbcafa2c4ad3aca1b9de63d2fa67eec9d276ac2e4ac110' 
  AND token = 'cA7ie0IyRn1ieEGGzP5P0iY1sdHc+v36R/jl3+3Nz8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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