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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95193ef4f23744141deb5b5f51839a8dd72254fb37e150c9cce771a1de714392' 
  AND token = 'eVPge/BZKflwoQ/Aleio7Uhd8u+neBVfk8fZquX9pXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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