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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c610468d8235572911de25797bd8026f170465268a3eb3129bf396f5f1c2886' 
  AND token = 'I4I1S4itfU3fXMmbE1W8Q22+THfTTR+6PuYx/GE748s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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