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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8114a63c00e11c6b79bafb79fe9dd94ffd278f7466111a647a536610ca3477cc' 
  AND token = 'h8643VXWn47rYNLRCSL9jDdP5NWmGy2DXpuU+BxMGQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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