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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c3d37950f6a2205bb46ff88502b153ae9713b06fbf5c163386f9564e3773c6' 
  AND token = 'u4lg8o/awWxHdwBW6d5WgRuFE7rABOo0vwnuRJqAA+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"
  }
}