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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c164a163dc15efecbcce8e4c8cf765380310c133cf3e1b309a410991b9397173' 
  AND token = 'nOu1o1Bk9c1A2LLSudRubxZkoR4rTGIrBKDw7FFA3og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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