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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc47008614750dd92a72041c4be67ffdc4de75eafec97a3f0b445990948e332' 
  AND token = 'Syt2Xv+EGDCIJrbOVwUIFS9aAzBCOwGB88mNScJerbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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