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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c1b6f2ecd252c5d2e298324dbf19e9fe584293d94220ba689e45eba8853c7b' 
  AND token = 'wDdXb0JX2o3DGCgBVSfgXa/LHNrs86Cm0Y5OKc9Q96A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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