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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20368b8755a94f73b146fbc6ed51a9ac20fedd1c061939dc7eb0f26a2552c23' 
  AND token = 'A7IIT1eJAvsMCKg5z3mvRilMiLr/gBh1ut6bUtRPiz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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