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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4780c64835ba2dfee06853c48db31c5039d9203a1f583a92e7bfd3eb5a5050' 
  AND token = 'f5pP7VJj4Y+lB+GH+2eeircXA8YWmrOdudQX/ym2LoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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