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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c97a95529cd211caf318b0c555a925b3d12b49ebc73477fcfd25e0e2ad40a32' 
  AND token = 'hquq19YrZ6Gxez7Cg7v2x550e9ENV9FVEbEtzbkkPts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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