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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72c5eb511053d32ea15f34c589589f3edad26ee753550b601c90f190f612e88' 
  AND token = 'gu1r/OcKxHIF8b1W2WWnvxM9lMG5HI4962wM8EjBRYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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