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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47ea90d2d6b284aa6857b27362d696443d343a047d6dd820022d2d1d5c4afa2' 
  AND token = 'UmbW0/0EyNReVEa+A/bba8uTRFrZhSblCYoThSbb9CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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