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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3319aa132a58867865545ca4c53d66a9247e1484fba81cb1033815f07a562174' 
  AND token = 'uOZFi8dmaIxZKzWsz+D0E5Jq+/8ymkDT6rXFqmjl4VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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