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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7eb8bdc8f1e15a094d9ebf51d70bfbbdb76075315f1c2d0c9e27796131a67be' 
  AND token = 'HQadUzrweXIgg/0+CVn1g6lWu2iUOO5IA3xRCxTxkoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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