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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a6e6ebcc6316773e4c7b245e98f10c7dd660ef0bc10fb827f5629490e80017' 
  AND token = '5RpmMJbKximWgCQ0D/qz3ZVFxi3FEP2x+oEh1dR4vXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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