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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6ea5f44440787142a9ba392c3088f4c2865d438d2941f39ab01e504862c8e9' 
  AND token = '58AWhWwKXYoTo88w5NgkoGg/BUIwof7KrM7Hvl7C4YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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