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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60fdabd6f1d17666936659c14a8248e2646796cb88c954761e24bd2886b79179' 
  AND token = 'QsEEEGtMVCc8pblbTNw+VDOkmG7S0XXxMLGB0/Bd45o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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