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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83c5a91557bf59a63b1072e8fcae0cfe47f2b294a0584e5336cf59678ed8eda' 
  AND token = 'fSWzG722ev1CO9FQSyZwQjsTS+/Z6s5xo7QMdUgydPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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