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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '490f0ac083fb7b66e63712ae26b54b54c7e7404672bf3bf2ac8da2b19b3315fb' 
  AND token = 'H1/cOCJ4T+TlVzlQrrQl0qyVYIKuvfjz47N56AcVv/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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