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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96868aba063b91b8cbd63c4c08df7bb944ddfb8c9567d716fb039bc41e1f19d' 
  AND token = '7BPPoQA4sIop0t6rm+fDQUrrkrpJyIQgrMS22S0Ri/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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