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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bca14490cde502626100e5cb6b495c1cc20250891c6b9afb066cb2fbbf7f8fd' 
  AND token = 'fGd412/Kc0BC1TIEDisJCUWrkpt1krnUxQlb1k7xee0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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