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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3496422f1c7bcfee0b5942c57b27b5475e1d6628caa0786e8d70973574cc031d' 
  AND token = 'E3Gy0jNyvUnCOIgq/RhpJ3SPdVMfe8Xvv0XhaRuXvHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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