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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b632e23b0b8c1f6828c01b58376cb0d741b188d341e96fd012660e30deee83' 
  AND token = 'hah2VcLBcge6oO4tp+GqmQFhPh/rHVJdYjehE6woydc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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