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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8f78a5facf1e47911963d6617bfcc2848e97b1035165bf500b283a55a1fec0' 
  AND token = '2RXtv0hrTHi06cB1fBv+ZSO/03lL47w40NBLyWFFPxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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