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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c1795e980bcb2628a15519794d60392e4e4bd483c63fee6f06a7f55858e07b' 
  AND token = 'ysxCxJ2m7+6PKb+KLQqT0H28Yt2Q2bq6KjmjyTjvnj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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