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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7419c72e199ec8b70d2ec0e0f4e052e6a1c6e94dab72a32aaad5177fb6846956' 
  AND token = '1wILUbjJvotmR6kQHXBFrRL6cS2+jyHCe9u0hFivaio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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