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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96a4f1712584ef3ab7b4a0a0ab3a6b8b6e7938f84b207fb37e1118d6a994163' 
  AND token = 'JKBkmAgypZVMP/7YKnrVxIi1+ZmbN31SJiHm5EX6h0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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