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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e8363eb556a1a03741d075e29666cdfc474a885737e23dd0e5297cbcb532d5' 
  AND token = 'Lo7BH8MP3lKuWzRqdl0dDNszZbz44WmtHr6XyldsxWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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