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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032a77325fecf4db28b5cf4e2107572e58b65be901ba34c702c94e43ee35ef3d' 
  AND token = 'lMt8ouYGSN1uCehxl7Q06ewUKMiKgfS1ZbZ0PSL98GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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