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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4baab36c14ff465abb46311768e0174864f5674e23c9b5d481a9d39f1b324a' 
  AND token = 'RUtLw818bve5xquC7n7wGchhHHyxLuFcZDRsfdrp5BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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