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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed955bde3c7e10c26a5a2afb9f2a1e7c4285ccbbb140b19206f8d8f04f02274a' 
  AND token = 'X1/XE9QmCCIcDNHbFd90g9QhpaQsnDH/57gxqk5U1ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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