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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0e7833f5c67550ed88ddcf7e3502f1538af26d240830720ba11b3f4ec08651' 
  AND token = 'vau9eajfFA7wK8ifrrrgltxgbESB8p7IM9GdxRvH/Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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